stdlib: add many missing __del__ methods (#11042)

stdlib/shelve.pyi

@@ -29,6 +29,7 @@ class Shelf(MutableMapping[str, _VT]):
     def __exit__(
         self, type: type[BaseException] | None, value: BaseException | None, traceback: TracebackType | None
     ) -> None: ...
+    def __del__(self) -> None: ...
     def close(self) -> None: ...
     def sync(self) -> None: ...